views_handler_filter_term_node_tid::init uses bitwise & by mistake

In the method views_handler_filter_term_node_tid::init, bitwise & is used where clearly && was intended:

if (isset($this->options['vid']) && !empty($this->options['vid']) & empty($this->options['vocabulary'])) {

In this case, the outcome would be the same regardless. But such mistakes should be corrected, because some adjustment to the if control structure, and this could cause a problem that is difficult to spot.

For example, suppose we change it to:

if ($this->options['vid'] & empty($this->options['vocabulary'])) {

Then half the time this works as expected.